If it's a 1-acre circle, the perimeter is 739feet 10inches .
If it's a rectangle, then it can be any distance greater than 834feet 10inches ,
but it can't be any less.
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1 acre = 4,046.8564 square meters
1 acre = 40.5 ares
Answer: 1 acre = 0.004046 km²
It is neither. An acre is 1 (or 1.0) acres, half an acre is 0.5 acres. 0.247 is close to 1/4 (which is exactly 0.25).
Answer: 1 acre = 4,046.86 m²